Bench Mark 3 grove button rifled

First are 3 grove BBLs tough on bullets? I need a new Barrel for my 6x284 currently I have a Hart and its about shot out? I was thinking of a Cut rifled BBL but speaking to this staff person at Bench Mark barrels has me thinking?

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From my experiance the 3 groove barrels are harder on bullets , the lands are bigger and work the jacket more.

If I were planning to build a real hot rod I'd use a cut rifled barrel from either Rock Creek or Bartlein with the 5R rifling , Broughton also makes a 5R barrel but its buttoned rather than cut.

I'm not sure that their is any real differance in barrel life with the buttoned compaired to the cut barrels but I have seen a marked increase in velocity with the 5R barrels over conventional land and grooves.

First are 3 grove BBLs tough on bullets? I need a new Barrel for my 6x284 currently I have a Hart and its about shot out? I was thinking of a Cut rifled BBL but speaking to this staff person at Bench Mark barrels has me thinking?

There has been a lot of discussion on this question so do a search on 3 grove barrels
and it will answer your questions.

I have limited experance with 3 grove barrels but the ones I have dealt with are very
good.

Yep , their should be alot of info in the search files , I remember Kirby Allen doing some test and such with his Allen mags , If I rememer correctly he had Lilja make some barrel that used thinned lands or somthing for his hot 257 or 270 for use with the realy long Wildcat bullets

Yep , their should be alot of info in the search files , I remember Kirby Allen doing some test and such with his Allen mags , If I rememer correctly he had Lilja make some barrel that used thinned lands or somthing for his hot 257 or 270 for use with the realy long Wildcat bullets

James.

Kirby did have problems with the 3 grove barrels but as I understood him to say they
were all fast twist for heaver bullets and the thin jacketed bullets came apart at high velocity.

Based on every ones experiance and recommendations I went with the slower twist for lighter
bullets hopeing I would not have the same problems.

So far I am pleased with the test I have done( break in loads were with 60gr .223 dia bullets)
and they produced a velocity of 3915 ft/sec and a SD of 6.

The next bullets I will try will be 50gr @ around 4200 ft/sec. and then 40gr bullets @ around
4400 ft/sec.